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3 Function/involvement in excretory systemThe Excretory SystemThe Excretory System: A system in the body that collects wastesproduced by cells and removes the wastes from the body.OrganFunction/involvement in excretory system1.KidneysEach kidney contains about 1 million nephrons, which filter the blood and eliminate urea, excess water, and other wastes.

4 The Excretory SystemThe kidneys are "bean-shaped" organs measuring approx. 10 cm long and 5.5 cm in width. The kidneys account for only 0.4% of body weight, however, they can filter 180 liters of blood each day.

5 Function / involvement in excretory systemThe Excretory SystemThe Excretory System: A system in the body that collects wastesproduced by cells and removes the wastes from the body.OrganFunction / involvement in excretory system1. KidneysEach kidney contains about 1 million nephrons, which filter the blood and eliminate urea, excess water, and other wastes.2. Ureters25-30 cm long tubes that transport urine from the kidneys to the urinary bladder.

6 The Excretory System Urine travels from each kidneythrough the ureters to theurinary bladder.

7 Function / involvement in excretory systemThe Excretory SystemThe Excretory System: A system in the body that collects wastesproduced by cells and removes the wastes from the body.OrganFunction / involvement in excretory system1. KidneysEach contain about 1 million nephrons, which filter the blood and eliminate urea, excess water, and other wastes from the body2. Ureters25-30 cm long tubes that transport urine from the kidneys to the urinary bladder3. UrinarybladderA sacklike muscular organ that stores urine.

8 The Excretory System When the bladder is full, its wallsstretch and you feel the needto urinate.

9 Function / involvement in excretory systemThe Excretory SystemThe Excretory System: A system in the body that collects wastesproduced by cells and removes the wastes from the body.OrganFunction / involvement in excretory system1. KidneysEach contain about 1 million nephrons, which filter the blood and eliminate urea, excess water, and other wastes from the body2. Ureters25-30 cm long tubes that transport urine from the kidneys to the urinary bladder3. UrinarybladderA sacklike muscular organ that stores urine.4. UrethraA small tube through which urine leaves the body from the urinary bladder.

11 The Excretory System The filtering processEach kidney contains about 1 million nephrons, which filter all of the blood in an adult’s body 20 to 25 times each day!

12 The Excretory System Blood from an artery enters the nephrons insideThe filtering processNephrons remove waste from the blood and produce urine.Urine formation is a multi-stage process.Blood from an arteryenters the nephrons insidethe kidneys

13 The Excretory SystemThe filtering processNephrons remove waste from the blood and produce urine.Urine formation is a multi-stage process.2. The blood reaches a cluster of capillaries where urea, water, glucose, and other substances are removed and enter a long twisting tube.

14 The Excretory SystemThe filtering processNephrons remove waste from the blood and produce urine.Urine formation is a multi-stage process.3. As the materials taken from the blood flow through the tube, needed materials such as glucose and water are reabsorbed into the bloodstream.

15 The Excretory SystemThe filtering processNephrons remove waste from the blood and produce urine.Urine formation is a multi-stage process.4. The remaining wastes (urea, other chemicals, and some of the water) remain in the tube and are packaged into urine.The urine is sent out of the kidneys, through the ureters and into the bladder.“Mrs. Harris or Mr. Adkins, can I please go to thebathroom now ?!?”

16 The kidneys play an important role in maintaining homeostasisThe Excretory SystemRemember what homeostasis means??The kidneys play an important role in maintaining homeostasisby regulating how water is put back into the blood inside the nephrons, and how much is removed from the body in the urine.If you’re playing soccer on a hot day and you haven’t drank much water, how will your kidneys react to maintain homeostasis??

17 The Excretory System Your need to drink at least 2 litersevery day for your kidneys to maintain the proper water balancein your body!!Eating fruits and vegetables that contain lots of water can help.

18 The Excretory System What if your kidneys stopped functioning??What possible problems could this cause in your body??A dialysis machine is designedto filter the blood just like your kidneys do.

20 Why are the lungs considered part of the excretory system?Other Organs of ExcretionA little bit of review…Why are the lungs considered part of the excretory system?

21 Function / involvement in excretory systemThe Excretory SystemThe Excretory System: A system in the body that collects wastesproduced by cells and removes the wastes from the body.OrganFunction / involvement in excretory system5. The LungsCarbon dioxide and water vapor are excreted throughthe alveoli and leave the body as you exhale.

23 What role does the skin play in the excretory system?Other Organs of ExcretionA little bit of review…What role does the skin play in the excretory system?

24 Function / involvement in excretory systemThe Excretory SystemThe Excretory System: A system in the body that collects wastesproduced by cells and removes the wastes from the body.OrganFunction / involvement in excretory system5. The LungsCarbon dioxide and water vapor are excreted through the alveoli and leave the body as you exhale.6. The SkinThrough the production/formation of perspiration (sweat), the skin gets rid of excess water, salts and urea through the pores.

25 The Excretory SystemOther Organs of ExcretionMany wastes need to be broken down before they can be excreted. The liver breaks down proteins to produce urea, which is then transported to the kidneys.

26 Function / involvement in excretory systemThe Excretory SystemThe Excretory System: A system in the body that collects wastesproduced by cells and removes the wastes from the body.OrganFunction / involvement in excretory system5. The LungsCarbon dioxide and water vapor are excreted through the alveoli and leave the body as you exhale.6. The SkinThrough the production/formation of perspiration (sweat), the skin gets rid of excess water, salts and urea through the pores.7. The LiverProduces urea, a waste product that comes from the breakdown of protein, and sends it to the kidneys.